Blender - Blender is the open source, cross platform suite of tools for 3D creation.
MakeHuman - MakeHuman is a free, open source, interactive modeling tool for creating custom 3D human characters.
Sculptris - Sculptris: Enter a world of digital art without barriers.
ZBrush - ZBrush is a digital sculpting and painting software solution.
Misfit Model 3D - Misfit Model 3D is a 3D model editor that basically operates with triangle-based models.
Bforartists - Bforartists is a fork of Blender.